Техническая Спецификация для Cisco Cisco 12000 Series 12-Port DS3 Line Card
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Data Sheet
Cisco 12000 Series
8-Port Fast Ethernet Line Card
8-Port Fast Ethernet Line Card
The Cisco
®
12000 Series 8-port Fast Ethernet Line Card (Figure 1) offers high-density and low-cost intra-point of presence
(POP) connectivity between the Cisco 12000 Series and other lower-end switches and routers (such as the Cisco Catalyst
®
5000, Catalyst 6000, and Catalyst 7500 routers). Service providers benefit from this high-density Fast Ethernet line card by
eliminating or reducing the need to implement and operate an intermediate layer of networking equipment between the Cisco
12000 Series and other switches and routers—and the results are significant cost savings, simplified network management,
improved network availability, and increased savings in rack space.
Figure 1. Cisco 12000 Series 8-Port Fast Ethernet Line Card
PRODUCT FEATURES
Table 1 describes the basic features on the Cisco 12000 Series Fast Ethernet line cards.
Table 1.
Product Features
Feature
Description
Packet Layer
•
Multiple virtual output queues, eliminating head-of-line blocking
•
512-KB burst buffers, which smooth out the arriving packet bursts
•
128-MB packet buffer on the transmit and receive directions
•
A forwarding table that can accommodate up to one million forwarding entries
•
Application-specific integrated circuit (ASIC)-based queuing
•
Quality-of-service (QoS) support
•
Configurable with up to 256 MB of code and route table memory
Ethernet Upper Layer
•
MAC with full-duplex (default) or half-duplex operation
•
8B/10B encoding and decoding
•
100BASE-TX copper interface, compliant with IEEE 802.3u specifications
•
Optional 100BASE-FX multimode interface, compliant with IEEE 802.3u specifications